DOM_TreeWalker.hpp
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- /*
- * The Apache Software License, Version 1.1
- *
- * Copyright (c) 1999-2002 The Apache Software Foundation. All rights
- * reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The end-user documentation included with the redistribution,
- * if any, must include the following acknowledgment:
- * "This product includes software developed by the
- * Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowledgment may appear in the software itself,
- * if and wherever such third-party acknowledgments normally appear.
- *
- * 4. The names "Xerces" and "Apache Software Foundation" must
- * not be used to endorse or promote products derived from this
- * software without prior written permission. For written
- * permission, please contact apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache",
- * nor may "Apache" appear in their name, without prior written
- * permission of the Apache Software Foundation.
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- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Software Foundation, and was
- * originally based on software copyright (c) 1999, International
- * Business Machines, Inc., http://www.ibm.com . For more information
- * on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- */
- /*
- * $Id: DOM_TreeWalker.hpp,v 1.3 2002/11/04 15:04:44 tng Exp $
- */
- #ifndef DOM_TreeWalker_HEADER_GUARD_
- #define DOM_TreeWalker_HEADER_GUARD_
- #include "DOM_Node.hpp"
- #include "DOM_NodeFilter.hpp"
- XERCES_CPP_NAMESPACE_BEGIN
- class TreeWalkerImpl;
- /**
- * <code>DOM_TreeWalker</code> objects are used to navigate a document tree or
- * subtree using the view of the document defined by its <code>whatToShow</code>
- * flags and any filters that are defined for the <code>DOM_TreeWalker</code>. Any
- * function which performs navigation using a <code>DOM_TreeWalker</code> will
- * automatically support any view defined by a <code>DOM_TreeWalker</code>.
- *
- * Omitting nodes from the logical view of a subtree can result in a structure that is
- * substantially different from the same subtree in the complete, unfiltered document. Nodes
- * that are siblings in the DOM_TreeWalker view may be children of different, widely separated
- * nodes in the original view. For instance, consider a Filter that skips all nodes except for
- * Text nodes and the root node of a document. In the logical view that results, all text
- * nodes will be siblings and appear as direct children of the root node, no matter how
- * deeply nested the structure of the original document.
- *
- */
- class CDOM_EXPORT DOM_TreeWalker {
- public:
- /** @name Constructors and assignment operator */
- //@{
- /**
- * Default constructor.
- */
- DOM_TreeWalker();
- /**
- * Copy constructor.
- *
- * @param other The object to be copied.
- */
- DOM_TreeWalker(const DOM_TreeWalker &other);
- /**
- * Assignment operator.
- *
- * @param other The object to be copied.
- */
- DOM_TreeWalker & operator = (const DOM_TreeWalker &other);
- /**
- * Assignment operator. This overloaded variant is provided for
- * the sole purpose of setting a DOM_NodeIterator to null.
- *
- * @param val Only a value of 0, or null, is allowed.
- */
- DOM_TreeWalker & operator = (const DOM_NullPtr *val);
- //@}
- /** @name Destructor. */
- //@{
- /**
- * Destructor for DOM_TreeWalker.
- */
- ~DOM_TreeWalker();
- //@}
- /** @name Equality and Inequality operators. */
- //@{
- /**
- * The equality operator.
- *
- * @param other The object reference with which <code>this</code> object is compared
- * @returns True if both <code>DOM_TreeWalker</code>s refer to the same
- * actual node, or are both null; return false otherwise.
- */
- bool operator == (const DOM_TreeWalker & other)const;
- /**
- * Compare with a pointer. Intended only to allow a convenient
- * comparison with null.
- */
- bool operator == (const DOM_NullPtr *other) const;
- /**
- * The inequality operator. See operator ==.
- */
- bool operator != (const DOM_TreeWalker & other) const;
- /**
- * Compare with a pointer. Intended only to allow a convenient
- * comparison with null.
- *
- */
- bool operator != (const DOM_NullPtr * other) const;
- //@}
- /** @name Get functions. */
- //@{
- /**
- * The <code>root</code> node of the <code>TreeWalker</code>, as specified
- * when it was created.
- */
- DOM_Node getRoot();
- /**
- * Return which node types are presented via the DOM_TreeWalker.
- * These constants are defined in the DOM_NodeFilter interface.
- *
- */
- unsigned long getWhatToShow();
- /**
- * Return The filter used to screen nodes.
- *
- */
- DOM_NodeFilter* getFilter();
- /**
- * Return the expandEntityReferences flag.
- * The value of this flag determines whether the children of entity reference
- * nodes are visible to the DOM_TreeWalker. If false, they will be skipped over.
- *
- */
- bool getExpandEntityReferences();
- /**
- * Return the node at which the DOM_TreeWalker is currently positioned.
- *
- */
- DOM_Node getCurrentNode();
- /**
- * Moves to and returns the closest visible ancestor node of the current node.
- * If the search for parentNode attempts to step upward from the DOM_TreeWalker's root
- * node, or if it fails to find a visible ancestor node, this method retains the
- * current position and returns null.
- *
- */
- DOM_Node parentNode();
- /**
- * Moves the <code>DOM_TreeWalker</code> to the first child of the current node,
- * and returns the new node. If the current node has no children, returns
- * <code>null</code>, and retains the current node.
- *
- */
- DOM_Node firstChild();
- /**
- * Moves the <code>DOM_TreeWalker</code> to the last child of the current node, and
- * returns the new node. If the current node has no children, returns
- * <code>null</code>, and retains the current node.
- *
- */
- DOM_Node lastChild();
- /**
- * Moves the <code>DOM_TreeWalker</code> to the previous sibling of the current
- * node, and returns the new node. If the current node has no previous sibling,
- * returns <code>null</code>, and retains the current node.
- *
- */
- DOM_Node previousSibling();
- /**
- * Moves the <code>DOM_TreeWalker</code> to the next sibling of the current node,
- * and returns the new node. If the current node has no next sibling, returns
- * <code>null</code>, and retains the current node.
- *
- */
- DOM_Node nextSibling();
- /**
- * Moves the <code>DOM_TreeWalker</code> to the previous visible node in document
- * order relative to the current node, and returns the new node. If the current
- * node has no previous node,
- * or if the search for previousNode attempts to step upward from the DOM_TreeWalker's
- * root node, returns <code>null</code>, and retains the current node.
- *
- */
- DOM_Node previousNode();
- /**
- * Moves the <code>DOM_TreeWalker</code> to the next visible node in document order
- * relative to the current node, and returns the new node. If the current node has
- * no next node,
- * or if the search for nextNode attempts to step upward from the DOM_TreeWalker's
- * root node, returns <code>null</code>, and retains the current node.
- *
- */
- DOM_Node nextNode();
- //@}
- /** @name Set functions. */
- //@{
- /**
- * Set the node at which the DOM_TreeWalker is currently positioned.
- *
- */
- void setCurrentNode(DOM_Node currentNode);
- //@}
- protected:
- DOM_TreeWalker(TreeWalkerImpl* impl);
- friend class DOM_Document;
- private:
- TreeWalkerImpl* fImpl;
- };
- XERCES_CPP_NAMESPACE_END
- #endif